Writer's Block: (like juggling chainsaws)

I'd really like to learn how to extract usable electric energy from the 'ether', I mean from all that air and space around us -- think about it: with an antenna, a tuned circuit and a diode, you can gather enough energy to power a headset (the old time crystal radio)...so, if you could somehow tap a wide range of frequencies and gang together a shitload of these 'receivers', doesn't it seem possible to snag some usable energy? just thinkin' :)